KR20210045835A - 반도체 박막 구조체 및 이를 포함하는 전자 소자 - Google Patents
반도체 박막 구조체 및 이를 포함하는 전자 소자 Download PDFInfo
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Abstract
Description
도 1b는 도 1a의 반도체 박막 구조체에 구비된 버퍼층 일부를 확대한 세부 구조와 두께 방향으로의 밴드갭 에너지 변화를 함께 보이는 도면이다.
도 2a는 실시예에 따른 반도체 박막 구조체의 개략적인 구조를 보이는 단면도이다.
도 2b는 도 2a의 반도체 박막 구조체에 구비된 버퍼층 일부를 확대한 세부 구조와 두께 방향으로의 밴드갭 에너지 변화를 함께 보이는 도면이다.
도 3a는 실시예에 따른 반도체 박막 구조체의 개략적인 구조를 보이는 단면도이다.
도 3b는 도 2a의 반도체 박막 구조체에 구비된 버퍼층 일부를 확대한 세부 구조와 두께 방향으로의 밴드갭 에너지 변화를 함께 보이는 도면이다.
도 4a는 실시예에 따른 반도체 박막 구조체의 개략적인 구조를 보이는 단면도이다.
도 4b는 도 4a의 반도체 박막 구조체에 구비된 버퍼층 일부를 확대한 세부 구조와 두께 방향으로의 밴드갭 에너지 변화를 함께 보이는 도면이다.
도 5 내지 도 12는 실시예에 따른 반도체 박막 구조체에 구비되는 버퍼층에 적용될 수 있는 단위층에 대한 구체적인 예시들을 보인 단면도들이다.
도 13은 실시예에 따른 반도체 박막 구조체의 개략적인 구조를 보이는 단면도이다.
도 14는 실시예에 따른 전자 소자의 개략적인 구조를 보이는 단면도이다.
도 15는 다른 실시예에 따른 전자 소자의 개략적인 구조를 보이는 단면도이다.
밴드갭 에너지 | 두께 | |
제1층 | mid | thick |
제2층 | small | thin |
제3층 | large | mid |
120, 2150 - 핵생성층
200, 210, 220, 230, 250, 2200 - 버퍼층
201-제1층
202-제2층
203-제3층
204-제4층
205-제5층
300, 2300 - 반도체층
1000, 1001, 1002, 1003, 1005 - 반도체 박막 구조체
2000 - 전자 소자
Claims (28)
- 기판;
상기 기판 상에 형성된 것으로,
제1 밴드갭 에너지를 가지며 제1두께의 제1층, 제2 밴드갭 에너지를 가지며 제2두께의 제2층 및 제3 밴드갭 에너지를 가지며 제3두께의 제3층을 포함하는 단위층이 복수회 반복 적층되며, 상기 단위층에서 상기 제1층, 제2층, 제3층 중 밴드갭 에너지가 가장 낮은 층이 나머지 두 층 사이에 배치되는, 버퍼층; 및
상기 버퍼층 상에 형성된 반도체층;을 포함하는, 반도체 박막 구조체. - 제1항에 있어서,
상기 단위층은
상기 기판에서 상기 반도체층을 향하는 제1방향을 따라, 상기 제1층, 상기 제2층, 상기 제3층의 순서로 배치되는, 반도체 박막 구조체. - 제2항에 있어서,
상기 제2두께는 상기 제1두께, 상기 제3두께보다 얇은, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1 층은 상기 기판의 휨을 조절하는 층인, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1 밴드갭 에너지는 상기 제2 밴드갭 에너지보다 크고 상기 제3 밴드갭 에너지 보다 작은, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1두께는 상기 제2두께, 상기 제3두께보다 큰, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1두께와 상기 제2두께의 합은 상기 제3두께의 2~15배의 범위인, 반도체 박막 구조체. - 제7항에 있어서,
상기 제1두께와 상기 제2두께의 합은 상기 제3두께의 4~9배의 범위인, 반도체 박막 구조체. - 제3항에 있어서,
상기 제3 층은 상기 버퍼층 내에서 상기 제1방향의 전류 흐름을 억제하는 층인, 반도체 박막 구조체. - 제3항에 있어서,
상기 제2 밴드갭 에너지와 상기 제3 밴드갭 에너지 간의 차이는
상기 제2 밴드갭 에너지와 상기 제1 밴드갭 에너지 간의 차이의 2배 이상인, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1층은 AlwGa(1-w)N(0<w≤0.5)으로 이루어지는, 반도체 박막 구조체. - 제11항에 있어서,
상기 제2층은 AlyGa(1-y)N(0<y≤0.1, y<w)으로 이루어지는, 반도체 박막 구조체. - 제12항에 있어서,
상기 제3층은 AlxGa(1-x)N(w<x≤1)으로 이루어지는, 반도체 박막 구조체. - 제13항에 있어서,
상기 제3층은 AlxGa(1-x)N(0.7≤x≤1)으로 이루어지는, 반도체 박막 구조체. - 제13항에 있어서,
상기 단위층은
상기 제3층 상에 배치되고, 상기 제3 밴드갭 에너지에서 상기 제1 밴드갭 에너지로 변화는 분포의 제4 밴드갭 에너지를 가지는 제4층을 더 포함하는, 반도체 박막 구조체. - 제15항에 있어서,
상기 단위층은
상기 제4층은 AlzGa(1-z)N으로 이루어지며, z는 상기 제1방향으로의 위치에 따라 다른 값을 가지며, z값의 평균값, z(average)는 y<w<z(average)<x 의 조건을 만족하는, 반도체 박막 구조체. - 제13항에 있어서,
상기 단위층은
상기 제2층과 상기 제3층 사이에 배치되고, 상기 제2 밴드갭 에너지에서 상기 제3 밴드갭 에너지로 변화는 분포의 제5 밴드갭 에너지를 가지는 제5층을 더 포함하는, 반도체 박막 구조체. - 제17항에 있어서,
상기 단위층은
상기 제5층은 AlvGa(1-v)N으로 이루어지고, v는 상기 제1방향에 따라 다른 값을 가지며, v값의 평균값, v(average)는 y<w<v(average)<x 의 조건을 만족하는, 반도체 박막 구조체, - 제11항에 있어서,
상기 제2층은 InyGa(1-y)N(0≤y≤0.2)으로 이루어지고,
상기 제3층은 AlN으로 이루어지는, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1층은 GaN으로 이루어지는, 반도체 박막 구조체. - 제20항에 있어서,
상기 제2층은 InGaN으로 이루어지고,
상기 제3층은 AlN으로 이루어지는, 반도체 박막 구조체. - 제3항에 있어서,
상기 단위층은
상기 제3층 상에 배치되고, 상기 제3 밴드갭 에너지에서 상기 제1 밴드갭 에너지로 변화는 분포의 제4 밴드갭 에너지를 가지는 제4층을 더 포함하는, 반도체 박막 구조체. - 제3항에 있어서,
상기 단위층은
상기 제2층과 상기 제3층 사이에 배치되고, 상기 제2 밴드갭 에너지에서 상기 제3 밴드갭 에너지로 변화는 분포의 제5 밴드갭 에너지를 가지는 제5층을 더 포함하는, 반도체 박막 구조체. - 제3항에 있어서,
상기 제1층, 상기 제2층 및 상기 제3층은 각각 Al, In, Ga, N을 포함하며 조성비가 서로 다른 4원계 질화물로 이루어지는, 반도체 박막 구조체. - 제1항에 있어서,
상기 버퍼층에서 상기 반도체층을 향하는 방향으로 갈수록 상기 복수의 단위층 각각에 포함된 층들의 밴드갭 에너지 평균값이 작아지는, 반도체 박막 구조체. - 제1항 내지 제25항 중 어느 하나의 반도체 박막 구조체;
상기 반도체층의 양측에 각각 접촉하며 서로 이격되게 형성된 소스 전극 및 드레인 전극; 및
상기 반도체층 상에 형성된 게이트 전극;을 포함하는, 전자 소자. - 제26항에 있어서,
상기 반도체층과 게이트 전극 사이에 형성된 디플리션층;을 더 포함하는, 전자소자. - 제26항에 있어서,
상기 디플리션층이 p-GaN인, 전자소자
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